Genesis 21:10

7 She saith also, `Who hath said to Abraham, Sarah hath suckled sons, that I have born a son for his old age?`

8 And the lad groweth, and is weaned, and Abraham maketh a great banquet in the day of Isaac`s being weaned;

9 and Sarah seeth the son of Hagar the Egyptian, whom she hath borne to Abraham, mocking,

10 and she saith to Abraham, `Cast out this handmaid and her son; for the son of this handmaid hath no possession with my son -- with Isaac.`

11 And the thing is very wrong in the eyes of Abraham, for his son`s sake;

12 and God saith unto Abraham, `Let it not be wrong in thine eyes because of the youth, and because of thy handmaid: all that Sarah saith unto thee -- hearken to her voice, for in Isaac is a seed called to thee.

13 As to the son of the handmaid also, for a nation I set him, because he [is] thy seed.`